package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * ClassName: DishServiceImpl
 * Package: com.sky.service.impl
 * Description:
 *
 * @Author: qmh
 * @Create: 2024/12/24 - 8:49
 * @Version: v1.0
 */
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和口味
     * @param dishDTO
     */
    @Transactional // 开启事务
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        // 1.向菜品表插入1条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.insert(dish);

//        获取insert语句生成的主键值
        Long id = dish.getId();

        // 2.向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

//        口味为空
        if(flavors == null || flavors.size() == 0)
            return;
//        批量插入
        flavors.forEach(dishFlavor -> dishFlavor.setDishId(id));
        dishFlavorMapper.insertBatch(flavors);

    }

    /***
     * 菜品分页查询你
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
//        判断当前菜品是否能够删除
//          -- 是否存在起售中的菜品
        for(Long id:ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
//                起售中 不可删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
            }
        }
        //          -- 是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getStemealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0)
//                当前菜品被关联不可删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);

//        删除菜品数据
        for(Long id: ids){
            dishMapper.deleteById(id);
//        删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    /**
     * 根据id查询菜品和对应口味数据
     * @param id
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
//        根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
//        根据id查询口味数据
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
//        查询数据封装成VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);

        dishVO.setFlavors(flavors);

        return dishVO;
    }


    /**
     * 根据id修改菜品基本信息 和 对应口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

//        修改菜品基本信息
        dishMapper.update(dish);

//        删除所有口味
        dishFlavorMapper.deleteByDishId(dish.getId());

//        重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if(flavors == null || flavors.size() == 0)
            return;
        flavors.forEach(dishFlavor -> dishFlavor.setDishId(dish.getId()));
        dishFlavorMapper.insertBatch(flavors);




    }

    @Override
    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    @Override
    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}